Fairmount Funds Management LLC - 21 Nov 2025 SCHEDULE 13D/A Report for DIANTHUS THERAPEUTICS, INC. Common Stock, $0.001 par value (DNTH)

Filing Manager
Fairmount Funds Management LLC
Reporting Manager
Fairmount Funds Management LLC
Security
DIANTHUS THERAPEUTICS, INC. Common Stock, $0.001 par value
Symbol
DNTH
Shares outstanding
43.7M shares
Disclosed Ownership
2.14M shares
Ownership
4.9%
Form type
SCHEDULE 13D/A
Filing time
25 Nov 2025, 21:00:22 UTC
Date of event
21 Nov 2025
Previous filing
15 Sep 2025
SEC
View on sec.gov

Reporting Managers (4)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Fairmount Funds Management LLC 4.9% 2.14M 0 2.14M /s/ Peter Harwin Peter Harwin, Managing Member 0001802528
Fairmount Healthcare Fund II L.P. 4.9% 2.14M 0 2.14M /s/ Peter Harwin Peter Harwin, Managing Member 0001769651
Peter Evan Harwin 4.9% 2.14M 0 2.14M /s/ Peter Harwin Peter Harwin 0001663607
Tomas Kiselak 4.9% 2.14M 0 2.14M /s/ Tomas Kiselak Tomas Kiselak 0001830177